Select "Extract to 'DLG18'" . This creates a dedicated folder for the files so they don't clutter your current directory.
Look for a README.txt or install.txt file inside. These files contain specific instructions from the creator on how to use the "DLG18" assets. Troubleshooting
Ensure you are using the 7-Zip tool specifically; standard Windows "Zip" folders often cannot read the .7z format.